Voltage Detector RT9818-11

®
RT9818
Micro-Power Voltage Detectors

General Description Features
The RT9818 is a micro-power voltage detector supervising  Internally Fixed Threshold 1.2V to 5V in 0.1V Step
the power supply voltage level for microprocessors (μP)  High Accuracy ±1.5%
or digital systems. It provides internally fixed threshold  Low Supply Current 3μ μA
levels with 0.1V per step ranging from 1.2V to 5V, which  No External Components Required
covers most digital applications. It features low supply  Quick Reset within 20μμs
current of 3μA. The RT9818 performs supervisory function  Built-In Recovery Delay Include 0ms, 55ms, 220ms,
by sending out a reset signal whenever the VDD voltage 450ms Options
falls below a preset threshold level. This reset signal will  Low Functional Supply Voltage 0.9V
last the whole period before VDD recovering. Once VDD  N-Channel Open-Drain Output
recovered upcrossing the threshold level, the reset signal  Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89
will be released after a certain delay time. RT9818 is Packages
provided in SC-82, SC-70-3, SOT-23-3, SOT-23-5 and  RoHS Compliant and 100% Lead (Pb)-Free
SOT-89 packages.
Applications
Ordering Information  Computers
RT9818 -  Controllers
Package Type
 Intelligent Instruments
U3 : SC-70-3
V : SOT-23-3  Critical μP and μC Power Monitoring
VL : SOT-23-3 (L-Type)  Portable/Battery-Powered Equipment
B : SOT-23-5
X : SOT-89
Y : SC-82 Marking Information
YR : SC-82 (R-Type)
For marking information, contact our sales representative
Lead Plating System
P : Pb Free directly or through a Richtek distributor located in your
G : Green (Halogen Free and Pb Free) area.
Threshold Voltage
12 : 1.2V
13 : 1.3V
: Typical Application Circuit
49 : 4.9V
50 : 5.0V
Reset Active Timeout Period
100k RT9818
A = 0ms (RESET) Pull Up GND
B = 55ms (RESET) VDD
C = 220ms (RESET) VDD
P
D = 450ms (RESET) RESET/
E = 0ms (RESET) RESET/ RESET
F = 55ms (RESET) RESET
G = 220ms (RESET)
H = 450ms (RESET)
Note :
Richtek products are :
 RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
 Suitable for use in SnPb or Pb-free soldering processes.
Copyright © 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
DS9818-11 August 2016 www.richtek.com

1
RT9818
Pin Configuration
(TOP VIEW)
GND NC VDD
RESET/
RESET NC
4 3 3
4 3
2 2
2
RESET/ VDD GND RESET/
RESET VDD GND
RESET
SC-82 SC-82 (R-Type) SC-70-3
VDD VDD NC NC
3 3 5 4
1 2 3
2 2 2 3
RESET/ GND GND RESET/ RESET/ VDD GND

RESET RESET/ VDD GND
RESET RESET RESET
SOT-23-3 SOT-23-3 (L-Type) SOT-23-5 SOT-89
Functional Pin Description

Pin Name Pin Function
GND Ground.
RESET Active low open-drain reset output.
RESET Active high open-drain reset output.
VDD Power pin.
Functional Block Diagram

VDD
RESET/
RESET
CMP Timer N MOS

VSET
GND
Threshold
Voltage Setting
POR
Power On Reset
Timing Diagram
VDD
VTH
0V
VRESET
Delay Time (0, 55, 220, 450ms)

0V
VRESET
Delay Time (0, 55, 220, 450ms)

0V
www.richtek.com DS9818-11 August 2016

2
RT9818
Absolute Maximum Ratings (Note 1)
 Terminal Voltage (with Respect to GND)
VDD ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
 All Other Inputs ------------------------------------------------------------------------------------------------------------- −0.3V to 6V
 Input Current, IVDD ---------------------------------------------------------------------------------------------------------- 20mA
 Power Dissipation, PD @ TA = 25°C
SC-70 / SC-82 --------------------------------------------------------------------------------------------------------------- 0.25W

SOT-23-3 --------------------------------------------------------------------------------------------------------------------- 0.4W
SOT-23-5 --------------------------------------------------------------------------------------------------------------------- 0.4W
SOT-89 ------------------------------------------------------------------------------------------------------------------------ 0.55W
 Package Thermal Resistance (Note 2)
SC-70 / SC-82, θJA --------------------------------------------------------------------------------------------------------- 400°C/W

SOT-23-3, θJA ---------------------------------------------------------------------------------------------------------------- 250°C/W
SOT-23-5, θJA ---------------------------------------------------------------------------------------------------------------- 250°C/W
SOT-89, θJA ------------------------------------------------------------------------------------------------------------------ 180°C/W
 Lead Temperature (Soldering, 10sec.) --------------------------------------------------------------------------------- 260°C
 Storage Temperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C
 ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)

 Junction Temperature Range --------------------------------------------------------------------------------------------- −40°C to 125°C
 Ambient Temperature Range --------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VDD = 3V, unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Operating VDD (VOUT) Range VDD 0.9 -- 6 V
Supply Current IDD VTH = 3V, VDD = 4.5V, T A = 27C -- 3 8 A
Reset Threshold VTH TA = 27C -- 1.2 to 5 -- V
Threshold Voltage Accuracy V TH TA = 27C 1.5 -- 1.5 %
V DD Drop to Reset Delay tRD Drop = V TH 125mV -- 20 -- s
RT9818A/E -- 0 --
Reset Active RT9818B/F 35 55 75
tRP VDD  1.02 x V TH ms
Time Out Period RT9818C/G 143 220 297
RT9818D/H 292 450 608
RESET Output Voltage Low
VOL 3 = VDD < V TH ISINK > 3.5mA -- -- 0.4 V
(Note 5)
Hysteresis Width VHYS -- 0.01V TH 0.016V TH V

3
RT9818
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. The voltage VOL can be calculated by VOL = VDD − Ir * R. Where R is the pull-up resistor and Ir is the current flowing
through the pull-up resistor. For typical application (R=100kΩ), VOL is less than 0.2V.

4
RT9818
Typical Operating Characteristics
Nch Driver Output Current vs. VDS Nch Driver Output Current vs. VDS
2.4 60
RT9818A-12 RT9818C-30
VDD = 1.1V VDD = 2.8V
2.0 50
Output Current (mA)
Output Current (mA)

40 VDD = 2.5V
1.6
1.2 30
VDD = 2V
VDD = 1V
0.8 20
0.4 10 VDD = 1.5V
0.0 0
0 0.3 0.6 0.9 1.2 1.5 0 0.5 1 1.5 2 2.5 3 3.5
VDS (V) VDS (V)
Nch Driver Output Current vs. VDS Output Voltage vs. Input Voltage
120 7
RT9818A-45 RT9818
100 6
Output Current (mA)
Output Voltage (V)
5
80
4
60 VDD = 4.4V
= 4V 3
40 = 3.5V 4.5V
= 3V 2
= 2.5V
20 = 2V 1 1.2V
= 1.5V
0 0
0 1 2 3 4 5 0 1 2 3 4 5 6
VDS (V) Input Voltage (V)
Supply Current vs. Input Voltage Supply Current vs. Input Voltage
6 4.0
RT9818A-12 RT9818C-30
3.5
5 80°C
80°C
Supply Current (μA)
3.0
4
2.5
25°C 25°C
3 2.0
1.5 −30°C
2
−30°C
1.0
1
0.5
0 0.0
0 1 2 3 4 5 6 0 1 2 3 4 5 6
Input Voltage (V) Input Voltage (V)

5
RT9818
Supply Current vs. Input Voltage Power Down Reset Delay vs. Temperature
4.0 14
RT9818A-45 RT9818A-12
Power Down Reset Delay (µs)

3.5 12
80°C
3.0
25°C 10
2.5
8 VDROP = 200mV
2.0 -30°C VDROP = 150mV
6
1.5
4 VDROP = 250mV
1.0
0.5 2
0.0 0
0 1 2 3 4 5 6 -50 -25 0 25 50 75 100 125
Input Voltage (V) Temperature (°C)
Power Down Reset Delay vs. Temperature Power Down Reset Delay vs. Temperature
45 45
RT9818C-30 RT9818A-45
Power Down Reset Delay (µs) 1
Power Down Reset Delay (µs)
40 40
35 35
30 30
25 25 VDROP = 200mV VDROP = 150mV

VDROP = 200mV
20 VDROP = 150mV 20
15 15
VDROP = 250mV
10 VDROP = 250mV 10
5 5
0 0
-50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125
Temperature (°C) Temperature (°C)
Reset Threshold Deviation vs. Temperature Nch Driver Sink Current vs. Input Voltage
6 40
RT9818 RT9818C-30, VDS = 0.5V
5V 35
−30°C
5
Sink Current ISINK (mA)
4.5V
Reset Threshold (V)
30
25°C
4
25
4.2V
20
80°C
3
15
2.2V
10
2
1.2V 5
1 0
-50 -25 0 25 50 75 100 125 0 0.5 1 1.5 2 2.5 3 3.5
Temperature (°C) Input Voltage (V)

6
RT9818
Nch Driver Sink Current vs. Input Voltage Power Up Reset Time-Out vs. Temperature
50 500
RT9818A-45, VDS = 0.5V RT9818C
Power Up Reset Time-Out (ms)

−30°C
40 400
Sink Current ISINK (mA)
25°C
VTH = 2.9V
30 300
80°C
20 200 VTH = 3V
10 100
0 0
0 1 2 3 4 5 -50 -25 0 25 50 75 100 125
Input Voltage (V) Temperature (°C)
Power Up Reset Time-Out vs. Temperature Output Delay Time vs. Load Capacitance
100 1000
RT9818A RT9818
Power Up Reset Time-Out (µs)
Output Delay Time (ms)
80 100
60 10
VTH = 5V
1 VTH = 1.2V
40
VTH = 4.5V
20 0.1
VTH = 4.5V
0 0.01
-50 -25 0 25 50 75 100 125 0.0001 0.0010 0.0100 0.1000 1.0000
Temperature (°C) Load Capacitance (µF)
Nch Driver Output Current vs. VDS Nch Driver Output Current vs. Input Voltage
160 60
RT9818G-31 RT9818G-31
Nch Driver Output Current (mA)1
Nch Driver Output Current (mA)1
140 VDS = 0.5V −30°C

50
120 25°C
40
100 VDD = 6V
= 5.5V
80 = 5V 30 80°C
= 4.5V
60 = 4V 20
= 3.5V
40
10
20
0 0
0 1 2 3 4 5 6 0 1 2 3 4 5 6
VDS (V) Input Voltage (V)

7
RT9818
Power Down Reset Time-Out vs. Temperature Output Voltage vs. Input Voltage
500 7
RT9818G-31
Power Down Reset Time-Out (ms)
RT9818G-31
6
400
Output Voltage (V)

5
300
4
3
200
2
100
1
0 0
-50 -25 0 25 50 75 100 125 0 1 2 3 4 5 6
Temperature (°C) Input Voltage (V)
Power Down Reset Time-Out vs. Temperature Threshold Voltage vs. Temperature
30 4.40
RT9818G-31
Power Down Reset Time-Out (µs)
RT9818A-42
4.35
25
Threshold Voltage (V) 1
4.30
20 Rising
4.25
VDROP = 200mV
VDROP = 150mV
15 4.20
Falling
4.15
10
VDROP = 250mV
4.10
5
4.05
0 4.00
-50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125
Temperature (°C) Temperature (C)
Threshold Voltage vs. Temperature

2.40
RT9818C-22
2.35
Threshold Voltage (V) 1
2.30
2.25 Rising
2.20
Falling
2.15
2.10
2.05
2.00
-50 -25 0 25 50 75 100 125
Temperature (C)

8
RT9818
Application Information
Multiple Supplies
Mainly, the pull-up connected to the RT9818 will connect
to the supply voltage that is being monitored at the IC's
VDD pin. However, some systems may use the open-
drain output to level-shift from the monitored supply to
reset circuitry powered by some other supply.
Benefits of Highly Accurate Reset Threshold

Most μP supervisor ICs have reset threshold voltages
between 1% and 1.5% below the value of nominal supply
voltages. This ensures a reset will not occur within 1% of
the nominal supply, but will occur when the supply is 1.5%
below nominal.

9
RT9818
Outline Dimension
H
D
L
C B
A
A1
b
Dimensions In Millimeters Dimensions In Inches

Symbol
Min Max Min Max
A 0.800 1.100 0.031 0.044
A1 0.000 0.100 0.000 0.004
B 1.150 1.350 0.045 0.054
b 0.150 0.400 0.006 0.016
C 1.800 2.450 0.071 0.096
D 1.800 2.250 0.071 0.089
e 1.300 0.051
H 0.080 0.260 0.003 0.010
L 0.210 0.460 0.008 0.018
SC-70-3 Surface Mount Package

10
RT9818
D H
e
L
C B
b b1
A
A1
e

Symbol
Min Max Min Max
A 0.800 1.100 0.031 0.043
A1 0.000 0.100 0.000 0.004
B 1.150 1.350 0.045 0.053
b 0.150 0.400 0.006 0.016
b1 0.350 0.500 0.014 0.020
C 1.800 2.450 0.071 0.096
D 1.800 2.200 0.071 0.087
e 1.300 0.051
H 0.080 0.260 0.003 0.010
L 0.200 0.460 0.008 0.018
SC-82 Surface Mount Package

11
RT9818
H
D
L
C B
A
A1
b

Symbol
Min Max Min Max
A 0.889 1.295 0.035 0.051
A1 0.000 0.152 0.000 0.006
B 1.397 1.803 0.055 0.071
b 0.356 0.508 0.014 0.020
C 2.591 2.997 0.102 0.118
D 2.692 3.099 0.106 0.122
e 1.803 2.007 0.071 0.079
H 0.080 0.254 0.003 0.010
L 0.300 0.610 0.012 0.024
SOT-23-3 Surface Mount Package

12
RT9818
H
D
L
C B
A
A1
e

Symbol
Min Max Min Max
A 0.889 1.295 0.035 0.051
A1 0.000 0.152 0.000 0.006
B 1.397 1.803 0.055 0.071
b 0.356 0.559 0.014 0.022
C 2.591 2.997 0.102 0.118
D 2.692 3.099 0.106 0.122
e 0.838 1.041 0.033 0.041
H 0.080 0.254 0.003 0.010
L 0.300 0.610 0.012 0.024
SOT-23-5 Surface Mount Package

13
RT9818
D
D1 A
B
C
C1
e e
H
b b
b1

Symbol
Min Max Min Max
A 1.397 1.600 0.055 0.063
b 0.356 0.483 0.014 0.019
B 2.388 2.591 0.094 0.102
b1 0.406 0.533 0.016 0.021
C 3.937 4.242 0.155 0.167
C1 0.787 1.194 0.031 0.047
D 4.394 4.597 0.173 0.181
D1 1.397 1.753 0.055 0.069
e 1.448 1.549 0.057 0.061
H 0.356 0.432 0.014 0.017
3-Lead SOT-89 Surface Mount Package
Richtek Technology Corporation

14F, No. 8, Tai Yuen 1st Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
14

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®

Micro-Power Voltage Detectors

DS9818-11 August 2016 www.richtek.com

RESET/ GND GND RESET/ RESET/ VDD GND

Functional Pin Description

Functional Block Diagram

CMP Timer N MOS

Delay Time (0, 55, 220, 450ms)

Delay Time (0, 55, 220, 450ms)

www.richtek.com DS9818-11 August 2016

SC-70 / SC-82 --------------------------------------------------------------------------------------------------------------- 0.25W

SC-70 / SC-82, θJA --------------------------------------------------------------------------------------------------------- 400°C/W

HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV

Recommended Operating Conditions (Note 4)

DS9818-11 August 2016 www.richtek.com

www.richtek.com DS9818-11 August 2016

Output Current (mA)

0.4 10 VDD = 1.5V

VDS (V) VDS (V)

Output Voltage (V)

DS9818-11 August 2016 www.richtek.com

Power Down Reset Delay (µs)

25 25 VDROP = 200mV VDROP = 150mV

Temperature (°C) Input Voltage (V)

www.richtek.com DS9818-11 August 2016

Power Up Reset Time-Out (ms)

Output Delay Time (ms)

Temperature (°C) Load Capacitance (µF)

140 VDS = 0.5V −30°C

DS9818-11 August 2016 www.richtek.com

Output Voltage (V)

Threshold Voltage vs. Temperature

www.richtek.com DS9818-11 August 2016

Benefits of Highly Accurate Reset Threshold

DS9818-11 August 2016 www.richtek.com

Dimensions In Millimeters Dimensions In Inches

SC-70-3 Surface Mount Package

www.richtek.com DS9818-11 August 2016

Dimensions In Millimeters Dimensions In Inches

SC-82 Surface Mount Package

DS9818-11 August 2016 www.richtek.com

Dimensions In Millimeters Dimensions In Inches

SOT-23-3 Surface Mount Package

www.richtek.com DS9818-11 August 2016

Dimensions In Millimeters Dimensions In Inches

SOT-23-5 Surface Mount Package

DS9818-11 August 2016 www.richtek.com

Dimensions In Millimeters Dimensions In Inches

3-Lead SOT-89 Surface Mount Package

Richtek Technology Corporation

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